INPUT GAIN
INPUT SECTION GAIN
OUTPUT SECTION GAIN
INPUT
REF.
AVERAGING TIME
FILTERS Ext.
22,4
Hz
A
DETECTOR
"Cal."
"1
V"
("0
dB")
"1 Voltage Multiplier" ("O
dB")
"Direct"
''Off''
"Fast"
"Off"
"Off"
"Off"
"Normal"
"Normal"
"RMS"
With these settings, full scale deflection on the measuring amplifier corresponds to
nominal recording level on the tape recorder, i.e.
1 V RMS.
3.
Introduce the attenuation required over and above that provided by the adaptor, via the
INPUT SECTION GAIN selector on the front panel
of
the 2610, so that the sensitivity
of
the
signal input to
the 2512 corresponds to that originally input
to
the tape recorder.
4.
The signal level is now correctly adjusted to be analyzed by the 2512 using the procedure
of
Section
3.4.
Example
of
attenuation determination
A signal with a maximum level
of
approximately
100
ms-
2
was recorded applying a
20
dB
amplification to bring the signal level up
to
the nominal record level
of
1 V on the tape
recorder. This gave a sensitivity
of
0,
1
ms-
2
/ mV, corresponding
to
100
ms-
2
at the nominal
record level
of
1
V.
On
replay, the sensitivity has
to
be reduced from
0,
1
ms-
2
/ mV to
1
ms-
2
I mV to match the input sensitivity
of
the 2512,
an
attenuation
of
20
dB. This can be
. obtained by using the Adaptor WB 0706 directly, or, using the Attenuator Set WB 0473,
selecting the
0,
1 pC / mV
(20
dB attenuation) position.
4.5. USE WITH THE TUNABLE BAND PASS FILTER TYPE
1621
40
Output
To
Ext
.
Filter
Input
From
Ext
. Fi
lter
AO 0087
AO
0087
Filter
Output
DC
Output
AO
0087
Human-
Response
Vibration
Meter
Type2512
Accelerometer
• •
.-.
Tunable Band
Pass
Filter
Type 1621
Signal
Input
Portable Level Control
Recorder Type
2306
Synchronisation
AO
0182
(For
2306
with
ser
i
al
number below
718059)
AO
0034
(For
2306
with
serial
number above
718058)
8104
32
Fig.
4.12.
Connecting the 2512 to the Tunable Band Pass Filter Type
1621
The Type
1621,
which is powered from internal batteries, is ideally suited
for
use with portable
instruments
suet, as the 2512. Its frequency range (from 0.2
Hz
to
20
kHz) covers the normal
Whole Body range (from
1 Hz to
80
Hz)
and the Hand - Arm range (from 8
Hz
to 1 kHz), with
bandwidths
of
23
% (approximately one third octave) and 3 % available. Inclusion
of
a Portable
Level Recorder Type 2306 in the measurement set-up
aJlows
the frequency analysis
to
be
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